Edward h



(No Model.)

B. H. HALL. SGREW PROPELLING APPARATUS FOR STEAM VESSELS. No: 332,709.

m 0? M W u. PETERS, Phflhrlilhcgmphur, Washington, D a

Nrrn rates ATENT rricn.

EDVARD H. HALL, OF BROOKLYN, NEW YORK.

SCREW-PROPELLING APPARATUS FOR STEAM-VESSELS.

SPECIFICATION forming part of Letters Patent No. 332,709, dated December22, 1885.

Application tiled October 20, 1884. Serial No. 145,943. (No model.)

To all whom it may concern.-

Be it known that I, EDWARD H. HALL, of the city of Brooklyn, in thecounty of Kings and State of New York, and a citizen of the UnitedStates of America, have invented a new and useful Improvement in theScrew- ]?ropelling Apparatus of Steam-Vessels, of which the following isa specification, reference being had to the accompanying drawings, inwhich Figure l is a horizontal section of the hull of a steam-vessel,cut on line a: a", Fig. 2, which may be regarded as also the waterline,showing also the side screw-propellers in elevation containingmyinvention. Fig. 2 is a side elevation of the same. Fig. 3 is a bowelevation. Fig. 4 is a cross-elevation on line 3 Fig. 2; and Fig. 5 is across-section on line 2 2, Fig. 1.

My invention relates to screw-propelling apparatus for steanrvesscls inwhich screwpropellers located at or about amid-ships or the waistlineare used in conjunction with the stern screw-propeller, one or more; andmy invention consists in the devices hereinafter described, and as moreat length recited in the claim.

A is the hull of the vessel, of any desired proper form and dimensions,although in con-. nection with my invention I prefer the coin parativelyflat-bottomed model and the waterline indicated in the drawings.

At B and B are guards, one 011 each side of the exterior of the hull,placed below the Water-line and extending lengthwise of the hull, theirbow ends curving inward and disappearing a little abaft the stem, asshown. These guards are hollow, and are preferably formed of iron platesbolted together, so that they constitute both guards and floats. Fromthe bow ends and from the stern ends to nearly the waist-line of thevessel these guards eX- tend or project laterally from the hull, withwalls or surfaces composed of planes approaching each other at andmeeting at an angle, so that in the portions specified these guards aretriangular in cross section, as shown in Fig. 4, the hull forming oneside of the triangle and the projected plane faces the other two sidesthereof. At or about the waistline of the vessel the form orconfiguration of these guards is changed to rectangular, as shown in thedrawings at B and B", and at about the ships waist these rectangularportions are cut away, as shown at B and B In these rectangular recessesor spaces 13* and B are located, respectively, the side propellerscrews, 0 and O, and the rectangular adjacent ends of the guards formingthese screw-propeller recesses should be of a width and heightcorresponding to the diameter of the screws 0 and C. By thisconstruction the screws 0 and O are effectively guarded against injury,being protected from contact with floating objects or docks by the sidesof the rectangular portions of the guards. The guard-floats B B aresupported and stayed in connection with the hull by means ofcross-beams, (represented by broken lines in Fig. 1,) framed into thehull, and with their ends projecting out into the guards, and with theplates constituting the guards bolted thereto. Upon these cross-beams ain the rectangular portions B B of the guards journalboxes b for theshafts of the screws 0 O are supported.

At D D are two sternscrews, which may be of the usual form andconstruction, and the shafts c 0 thereof pass through the interior ofthe stern ends of the triangular guards B B, in which they aresupported, journaled in suitable journal-boxes, and extending forwardwithin the hull to their connection with the motive power.

I do not deem it necessary to show or de scribe the steam-engines, northe mechanism for furnishing and communicating power to thepropeller-shafts, as these may be any of such well-known devices.

I am aware that side propellers have been heretofore employed, and hencedo not claim the same as new herein. I am also aware that such sidepropellers have been located in recesses formed in the ships hull; butwhen thus located they have not been effectively guarded against injury,as is the casein my present in vention, due to the rectangular structureof the guards at B and B, such rectangular portions being of an extentvertically and laterally corresponding to the diameter of the screwsinclosed thereby. I am aware that guards or floats of semicircularcross-section have heretofore been projected from the hull of a ves- ICOsel, and that the propeller-shafts have been located therein; but suchsemicircular guards or floats presented great resistance to theiwater inthe forward movement of the vessel, and at the same time were notadapted to protect the side propellers. Both of these difficulties areovercome by my invention, the triangular portions of my guards offeringa minimum of resistance to thewater when the vessel is moving forward,and at the same time giving great buoyancy and steadiness to the vessel,and, also, owing to the form of the rectangular portions B and Beffectively guarding the side screws.

WVhat I claim, therefore, as my invention, and desire to secure byLetters Patent, is

B and B together with the side screws, (1

and 0, located respectively in said recesses, and the stern screws, allas and for the purpose set forth. I 1

EDWARD H. HALL.

WVitnesses:

WM. BUssEY, A. G. N. VERMILYA.

